摘要
研究了热处理工艺对M2高速钢组织和性能的影响。结果表明:M2高速钢淬火后的组织为淬火马氏体+残留奥氏体+大量碳化物;随着淬火温度的升高,M2钢淬火后残留奥氏体含量(质量分数)升高,经3次回火后残留奥氏体基本上完全消除,增加冷处理后残留奥氏体的含量相对于3次回火的要多,钢的强度和韧性得到改善。对比M2高速钢在不同热处理工艺条件下的组织和性能,最佳热处理工艺为850℃×30 min预热+1160℃×30 min淬火+(-65℃×1 h)冷处理+560℃×2 h回火3次。
Effect of heat treatment on microstructure and properties of the M2 high speed steel was studied.The results show that the microstructure of the M2 steel after quenching is quenched martensite+retained austenite+a large amount of carbides.With quenching temperature increasing,the content(mass fraction)of retained austenite in the M2 steel increases,the retained austenite after three times of tempering is basically completely eliminated,while the content of retained austenite after adding subzero treatment is higher than that after three times of tempering,which results in the improvement of strength and toughness of the steel.Comparing the microstructure and properties of the steel under different heat treatment conditions,the best heat treatment process is 850℃×30 min preheating +1160℃×30 min quenching+(-65℃×1 h)subzero treatment +560℃×2 h tempering for 3 times.
作者
李亮军
张家敏
迟宏宵
周健
Li Liangjun;Zhang Jiamin;Chi Hongxiao;Zhou Jian(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Special Steels Research Institute,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2021年第9期72-79,共8页
Heat Treatment of Metals
关键词
M2高速钢
淬火
回火
冷处理
组织
性能
M2 high speed steel
quenching
tempering
subzero treatment
microstructure
mechanical properties
